Calculation of material and heat balance of melting refined ferrochrome using the new complex reducing agent of aluminosilicochrome

A.M. Baisanova; Ye.Zh. Shabanov; K.V. Grigorovich

doi:10.31643/2020/6445.37

Authors

A.M. Baisanova "Karaganda State Technical University" Karaganda, Kazakhstan
Ye.Zh. Shabanov Chemical and metallurgical Institute named after Zh. Abishev, Karaganda, Kazakhstan
K.V. Grigorovich Institute of Metallurgy and Materials Science. A.A. Baikova, RAS, Moscow, Russian Federation

DOI:

https://doi.org/10.31643/2020/6445.37

Keywords:

refined ferrochrome, aluminosilicochrome , reductant, ferroalloy, material balance.

Abstract

The article presents the results of calculating the material and thermal balances of refined ferrochrome (RFeCr) smelting using a new reducing agent. According to the results of the material balance and enlarged laboratory tests, it was found that when the traditional reducing agent silicochrome (FeSiCr48) is completely replaced with a complex alloy of aluminosilicochrome (FeAlSiCr), a metal of the following chemical composition can be obtained, %: Cr 66.8-69.1; C 0.21-0.29, Si 1.91-2.02. The composition of FeAlSiCr for silicon and chromium is the same as that of FeSiCr48, but additionally contains Al. In the process of obtaining refined ferrochrome, this aluminum passed into slag and changed its phase composition. In the CaO-MgO-Al₂O₃-SiO₂ system, the phase composition of the slag moved from the region of bicalcium silicate to the region of helenite, which allowed to obtain non-crumbling slags. In addition, due to the high activity of FeAlSiCr (where, ∑ = Si + Al ≥ 60%), the basicity of the slag was maintained at the level of CaO/SiO₂ = 1.6-1.7, against to 2. Based on the results of the heat balance calculation, it was found that the use of a complex FeAlSiCr reducing agent leads to a 24% reduction in electricity consumption. The low power consumption compared to the classical technology is explained by the presence of two active elements in the FeAlSiCr, silicon and aluminum. Thus, the amount of heat introduced by exothermic reactions prevails with the heat introduced by electrical energy.

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Author Biographies

A.M. Baisanova, "Karaganda State Technical University" Karaganda, Kazakhstan

Doctoral student of Karaganda Technical University, Karaganda, Kazakhstan.

Ye.Zh. Shabanov, Chemical and metallurgical Institute named after Zh. Abishev, Karaganda, Kazakhstan

PhD, head of the laboratory "Ferroalloys and recovery processes", Chemical and metallurgical Institute named after Zh. Abishev, Karaganda, Kazakhstan

K.V. Grigorovich, Institute of Metallurgy and Materials Science. A.A. Baikova, RAS, Moscow, Russian Federation

Doctor of Engineering Sciences, head of the Center for collective use of scientific equipment "Diagnostics of materials" of the Institute of metallurgy and materials science. A. A. Baykov, RAS, Moscow, Russian Federation.

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